package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是个临时文件，需要转存到指定位置，否则本次请求之后将会被删除
        log.info(file.toString());
        //获取文件原始名字
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid创建新的名字
        String filename = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //将文件存储到指定位置
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器中展示图片
            ServletOutputStream fileOutputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            byte[] bytes = new byte[1024];
            int len;
            while ((len = fileInputStream.read(bytes)) != -1) {
                fileOutputStream.write(bytes,0,len);
                fileOutputStream.flush();
            }
            //关闭资源
            fileOutputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
